import java.util.concurrent.Semaphore;

public class ThreadDemo9 {
    private static int count = 0;
    public static void main(String[] args) throws InterruptedException {
        Semaphore semaphore = new Semaphore(1);
        Thread t1=new Thread(()->{
           for(int i=0;i<50000;i++){
               try {
                   semaphore.acquire();
               } catch (InterruptedException e) {
                   throw new RuntimeException(e);
               }
               count++;
               semaphore.release();
           }
        });
        Thread t2=new Thread(()->{
            for(int i=0;i<50000;i++){
                try {
                    semaphore.acquire();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                count++;
                semaphore.release();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(count);

//        semaphore.acquire();
//        System.out.println("P操作");
//        semaphore.acquire();
//        System.out.println("P操作");
//        semaphore.acquire();
//        System.out.println("P操作");
//        semaphore.release();
    }
}
